Apparatus for coating molds



, G. A. EYNON ET AL.

AFPARATUS FOR COATING MOLDS Filed May' l2, 1925 Aug. 25,1925

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Patented ug. 25, 1925. l

UNITED STATES GEORGE A. EYNON, DANIEL I-I. MELOCI-IE, AND STANLEY M.UD'ALE, OF DETROIT, MICHIGAN, ASSIGN ORS TO EARL HOLLEY, OF DETROIT,MICHIGAN.

i 1,550,685 PATENT OFFICE.

APPARATUS FOR COATING MOLDS.

Application filed May 12,

To all whom t may concern:

Be it known that we, GEORGE A. EYNON, DANIEL I-I. MELooI-In, and STANLEYM. UDALE, citizens of the United States, residing at 3250 Lothrop Ave.,2241 Gladstone Ave., and 893 Lothrop Ave., respectively, Detroit, in thecounty of Wayne and State of Michigan, have invented certain new anduseful Improvements in Apparatus for Coating Molds, of which thefollowing is a speciiication.

The object of this invention is to provide means for coating metal moldswith a. film o-f carbon, the carbon being supplied as a suspension inoil and distributed as a spray. The existing apparatus for coating moldsconsists of a burner in which illuminating gas is consumed, the expenseof which is a considerable item in the production of large castings.

Figure I shows the preferred form of construction.

Figure II shows diagrammatically the principle of operation.

1 is a reservoir heated by a jacket 2, there being an entrance 3 and anexit 4 therefrom for conducting the heating fluid around thereservoir 1. 5 is a perforated diaphragm within the reservoir 1. 6 is anair entrance. 7 is a valve preferably controlling a supply of compressedair to the reservoir 1. 8 is a nozzle communicating to the lower end ofthe reservoir 1 above the perforated diaphragm 5. 9 is a cleaning andadjusting rod concentric with the nozzle 8. 10 is the restricted outletof the nozzle 8 into which the cleaning needle 9 may preferably proect.J 11 is a venturi formed construction from the reservoir 1 into whichthe nozzle discharges. 12 is the detachable cover of the reservoir 1 and13 is a perforated diaphragm in the upper portion of the reservoir 1. 14is a flexible pipe connecting the cover 12 with a series of nozzles ina'spraying device 15. 16 and 17 are two stone-faced iron molds which arebeing coated with the liquid contained in the reservoir 1.

18 is a lever adapted to be manually operated, connected to the needle 9and held in position by a spring 19, and pivoted about the fulcrum 20 sothat by depressing the extreme end of 18 the needle 9 is raised and theorifice 1()y of the nozzle 8 is positively cleared of any obstruction.21 is an adjust- 1923. Serial No. 638,470.

able sto-p for regulating the opening of the orifice 10 by the needle 9.22 is the liquid contained in the reservoir 1.

In the perforated plate 5 the perforations 23 and 24 allow the airadmitted at 6 to pass up through the liquid and thereby agitate andthoroughly mix the lampblack with the iron so as to maintain thelampblaclr uniformly distributed throughout the mass of the iron. 25,26, 27 and 28 are tubes which project up from the perforated plate 5 andallow air to pass directly from 6 to the upper portion of the reservoir1 so that the larger portion of the air flowing in at 6 escapes to theupper portion of the reservoir 1 without passing through the liquid anda minor portion of the air passes through the liquid and therebymaintains the lampblaclr in suspension.

In Figure II, which shows diagrammatically the principle of operation inFigure I, 30 is the reservoir containing the liquid to be sprayed, 31 isthe entrance for the compressed air or other gas, 32 is the outlet forthe compressed air above the level of the liquid, 33 are the outletsbelow the level of the liquid, the air which passes through which servesto mix the liquid and lampblack thoroughly together. 34 is the liquidnozzle and 35 is the Venturi tube into which the nozzle discharges.

Mode of operation-A mixture of oil,

preferably of the paraffin series, having lampblaclr suspended thereinis placed in the reservoir 1. Compressed air is delivered through thevalve 7, pipe 6, to the lower portion of the reservoir 1 beneath ,thediaphragm 5. This air bubbles through the liquid 22 contained in thereservoir 1, thereby agitating the liquid and causing the carbon to bethoroughly mixed with the oil. rIhe air in theupper portion of thereservoir l passes through the perforations in the diaphragm 13 and soto the venturi 11. In the Venturi tube 11, there is thnsnydepressionrelative to the pressure that exists in the upper portion of thereservoir 1, and a flow of liquid from the reservoir 1 up the tube 8 anddischarging into the venturi 11 results.

Hence the mixture of airLoiLzmd ,lampblack is carried through the pipe14 to the lower portion of the spraying device 15, whence it isdistributed over the surface of the molds 16 and 17, thereby coatingthese molds with the lampblack held in suspension in the reservoir 1,the oil being evaporated by the heat of the molds 16 and 17. Should thenozzle 10 at any time become clogged, by merely depressing the lever 18the needle 9 is forced through the nozzle 10 and the obstruction thereincleared. The spring 19 will then positively return the needle 9 to theposition determined by the adjustable stop 21.

When thicker oils than kerosene are used, such as fuel oil and wastelubricating oil, it may be necessary to raise the temperature of the oilduring cold weather. For this reason a jacket 2 is provided throughwhich steam may be passed.

Obviously when steam is not available a burner may be provided and theheat confined to the reservoir 1 by means of a jacket similar to thatshown, but with the lower portion oi' the jacket flared. Of course, theuse of either a burner or of steam are equivalent means for heating theliquid 22 in the reservoir 1.

The operation of the device shown in Eig. II is intended to be the samein principle as the operation of Fig. I.

The device is also adapted to be used for using a combustible mixturewhich may be ignited and which ignited mixture would deposit carbon in awell known manner. The function of the mixing device, in conjunctionwith the atomizing device, is to enable an oil containing a wide rangeof mixture, such as the Waste oil which is removed from the crank caseof automobile engines, in the reservoir.

The danger with using such oils is that they will separate out, theheavier oils going to the bottom and the lighter oils going to the top.Further, there is in such oils a good deal of solid matter insuspension, chiefly carbon from the engine and dust from the atmosphere.Unless these mixed oils are agitated the heavier oils, together With thesolid particles, would accumulate and clog up the nozzle.

lVhat we claim is:

1. In a lampblacking device, a liquid reservoir containing lampblack insuspension, a connection admitting compressed air to the bottomgfaidlsl'voir, a perforated diaphrgnn thealewer portion of saidlreservoir, a liquid atomizing nozzle connected to the lower portion ofsaid reservoir above saldperforated diaphragm, a restr1cted air outletleading from said reservoir, said fuel nozzle discharging into said'restricted air outlet, a spraying device connected to said restrictedoutlet and adapted to distribute the suspended lampblack over a surface.

2. In a mixing and spraying device, a liquid reservoir containinglampblack in suspension in a relatively non-volatile liquid, a passagefor the admission of compressed'air beneath the level of the liquid insaid reservoir, a passage for the admission of' compressed air above thelevel of the liquid in said reservoir, a restricted air outlet from thesaid reservoir, a liquid atomizing nozzle extending below the level ofthe liquid fuel and discharging into said restricted air passage.

3. In a mixing and spraying device, a liquid reservoir containinglampblack in suspension in a relatively non-volatile liquid, a. passageadmitting compressed air beneath the level of said liquid in saidreservoir, an air outlet from said reservoir, a liquid atomizing nozzleextending beneath the level of said liquid and adapted to discharge thesaid liquid into the air outlet from said reservoir.

1. In a mixing and spraying device, a reservoir containing a relativelynon-vola.- tile liquid, means for admitting a compressed gas to saidliquid reservoir, means for discharging said gas from said reservoir ina confined stream, a. nozzle adapted to discharge liquid into saidstream Whereby the liquid is first agitated in the reservoir and thensprayed into the confined stream.

5. In a. mixing and spraying device, a reservoir containing a liquid,means for admitting a compressed gas to said liquid reservoir, means fordischarging said gas from said reservoir in a confined stream, a nozzleadapted to discharge the liquid into said stream, aneedle adapted tocontrol the discharge from said nozzle and to clean said nozzle, wherebythe liquid is first agitated within said reservoir and then sprayed intothe said conned stream.

In testimony whereof we aiiix our signatures.

GEORGE A. EYNON. DANIEL H. MELOCHE. STANLEY M. UDALE.

